<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            width: 100px;
            height: 100px;
            border: 1px solid red;
        }
        span {
            float: left;
            display: block;
            width: 100px;
            height: 100px;
            border: 1px solid blue;
        }
        img {
            width: 100px;
            height: 100px;
            display: none;
        }
    </style>
</head>
<body>
    <img src="../day01/bg.png" alt="">
    <img src="../day01/bg.png" alt="">
    <img src="../day01/bg.png" alt="">
    <div>div1</div>
    <div>div2</div>
    <div>div3</div>
    <span>span1</span>
    <span>span2</span>
    <span>span3</span>
</body>
</html>